from: Stephen Press
I was sent to shoot a story on underwater hockey. If I had been given notice I could have gotten an underwater housing but as this is news and they’ve only known about it for two days before* so the pool had a maintenance tunnel around it and by removing a light I could shoot into the pool as if I was underwater, but how to get the sound?

Take a lapel mic. Put it inside a balloon and inflate slightly. Gaffer tape balloon tightly closed. Gaffer a weight to the cable under the balloon and lower into the pool. Works unbelievably well, though the level is high as the water amplifies the sound.